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Place the chopped chocolate in a small heat-proof bowl and microwave in 30-second intervals, stirring after each interval, until chocolate is melted and smooth.
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Set aside to cool while you continue with the filling.
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Place the cream cheese and sugar in a large mixing bowl and beat with an electric mixer on high speed for 5 minutes, stopping the mixer to scrape down the sides and bottom of the bowl as necessary.
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Add the eggs, vanilla, and salt and beat to combine.
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Scrape down the sides and bottom of the bowl, then beat in the chocolate until well combined. Scrape down the sides and bottom of the bowl, then beat 30 seconds more.
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Tap the bowl on the counter a few times to remove any bubbles, then pour half of the filling into the crust.
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Dollop half of the raspberry swirl over the filling and use a butter knife to swirl the two together, taking care to avoid poking the crust with the knife.
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Pour the remaining cheesecake filling on top, then repeat the dolloping and swirling with the remaining raspberry mixture.
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Set the cheesecake on a large rimmed baking sheet and bake 36 to 46 minutes, until the edges are set but the center of the cheesecake jiggles a bit with you tap the pan.
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Cool cheesecake to room temperature on a wire rack, then cover loosely with plastic wrap and refrigerate for at least 8 hours.